Spring : JPA的单独使用

title: 如何单独使用spring data jpa

引用pom文件:

        <dependency>

            <groupId>org.springframework.data</groupId>

            <artifactId>spring-data-jpa</artifactId>

            <version>2.1.5.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.hibernate</groupId>

            <artifactId>hibernate-core</artifactId>

            <version>5.3.5.Final</version>

        </dependency>

        <dependency>

            <groupId>org.hibernate</groupId>

            <artifactId>hibernate-c3p0</artifactId>

            <version>5.3.5.Final</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.47</version>

        </dependency>

        <dependency>

            <groupId>com.mchange</groupId>

            <artifactId>c3p0</artifactId>

            <version>0.9.5.2</version>

        </dependency>

编写配置类:

package com.config;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.Configuration;

import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

import org.springframework.orm.jpa.JpaTransactionManager;

import org.springframework.orm.jpa.JpaVendorAdapter;

import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;

import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;

import org.springframework.transaction.PlatformTransactionManager;

import javax.persistence.EntityManagerFactory;

import java.util.Properties;

/**

 * @author Zhai

 * 2019/04/02 15:10

 */

@Configuration

@ComponentScan(basePackages = {"com"})

// 指定Repository所在的包

@EnableJpaRepositories(basePackages = {"com.domain"})

public class JpaConfig {

    // 名字必须是entityManagerFactory,或者把@bean中name属性设置为entityManagerFactory

    @Bean

    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {

        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();

        // 设置数据库(如果在hibernate中配置了连接池,则不需要设置)

//        em.setDataSource(dataSource());

        // 指定Entity所在的包

        em.setPackagesToScan("com.domain");

        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();

        em.setJpaVendorAdapter(vendorAdapter);

        // 配置属性

        Properties properties = new Properties();

        properties.setProperty("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");

        properties.setProperty("hibernate.connection.url", "jdbc:mysql://10.8.3.38:3306/test");

        properties.setProperty("hibernate.connection.username", "root");

        properties.setProperty("hibernate.connection.password", "root");

        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");

        properties.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");

        properties.setProperty("hibernate.c3p0.min_size", "1");

        properties.setProperty("hibernate.c3p0.max_size", "10");

        properties.setProperty("hibernate.hbm2ddl.auto", "create");

        properties.setProperty("hibernate.show_sql", "true");

        properties.setProperty("format_sql", "true");

        em.setJpaProperties(properties);

        return em;

    }

    // 名字必须是transactionManager,或者把@bean中name属性设置为transactionManager

    @Bean

    public PlatformTransactionManager transactionManager(

            EntityManagerFactory emf) {

        JpaTransactionManager transactionManager = new JpaTransactionManager();

        transactionManager.setEntityManagerFactory(emf);

        return transactionManager;

    }

}

测试代码:

package com;

import com.config.JpaConfig;

import com.domain.Student;

import com.domain.StudentRepository;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.List;

/**

 * @author Zhai

 * 2019/04/02 14:27

 */

public class JpaTest {

    public static void main(String[] args) {

        ApplicationContext context = new AnnotationConfigApplicationContext(JpaConfig.class);

        // 获取repository

        StudentRepository studentRepository = context.getBean(StudentRepository.class);

        Student student1 = new Student();

        studentRepository.save(student1);

        List<Student> students = studentRepository.findAll();

        System.out.println(students);

    }

}